______ it rain tomorrow, we would have to put off the visit to the Water Cube.
A.ShouldB.CouldC.HadD.Were
A

試題分析:條件句的虛擬語(yǔ)氣是考查的重點(diǎn)。如果過(guò)去事實(shí)相反,條件句中使用過(guò)去完成時(shí),主句使用“情態(tài)動(dòng)詞+have done”;如果主句與現(xiàn)在事實(shí)相反,條件句中使用過(guò)去時(shí),be動(dòng)詞使用were,主句中使用“情態(tài)動(dòng)詞+動(dòng)詞原形”;如果與將來(lái)事實(shí)相反,條件句中有三種:過(guò)去時(shí);were to do ;should+動(dòng)詞原形,主句使用“情態(tài)動(dòng)詞+動(dòng)詞原形”;要特別注意如果省略了if,句子要使用部分倒裝的形式,把助動(dòng)詞,be動(dòng)詞,情態(tài)動(dòng)詞提之主語(yǔ)前。根據(jù)本句中的tomorrow可知這是與將來(lái)事實(shí)相反的虛擬語(yǔ)氣,使用should+動(dòng)詞原形,而且省略了if,構(gòu)成部分倒裝的形式。句義:如果明天下雨,我們就推遲去水立方的參觀。故A正確。
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